Control device, control method, and control program

1. A control device that controls power supply from a battery to a predetermined load via an electric circuit, the control device comprising: an acquisition unit that acquires a state of the battery; and an activation control unit that: is able to execute a state transition between activation and stop of the control device; controls the electric circuit based on the state of the battery acquired by the acquisition unit; and controls the electric circuit so as to maintain a state in which the battery and the predetermined load are electrically connected to each other and stops part of functions of the control device when the state of the battery is a state in which power is suppliable to the predetermined load after the control device is activated, wherein the electric circuit includes a DC-DC converter that controls charging and discharging of the battery, and a relay for disconnecting the battery from the DC-DC converter; the activation control unit includes a first control unit that controls the DC-DC converter and a second control unit that controls the relay; and one control unit from the first control unit and the second control unit includes the acquisition unit and the activation control unit, and the other control unit from the first control unit and the second control unit transitions an activation state and a stop state of the control device in accordance with control executed by the one control unit.

2. The control device according to claim 1, wherein the activation control unit controls the electric circuit so as to maintain a state in which the battery and the predetermined load are electrically disconnected from each other and stops the control device when the state of the battery is not a state in which power is suppliable to the predetermined load after the control device is activated.

3. The control device according to claim 1, wherein the activation control unit activates the control device upon receipt of a power-supply request from the predetermined load.

4. The control device according to claim 1, wherein the activation control unit periodically activates the part of the functions of the control device and determines the state of the battery while the part of the functions of the control device is stopped.

5. The control device according to claim 1, wherein the activation control unit maintains the DC-DC converter in a charge and discharge state and maintains the relay in a conductive state so as to maintain the state in which the battery and the predetermined load are electrically connected to each other.

6. The control device according to claim 1, wherein the one control unit determines the state of the battery by repeating activation and stop for each predetermined time while the state in which the battery and the predetermined load are electrically connected to each other is maintained.

7. The control device according to claim 1, wherein: the control device is mounted on a vehicle; and the activation control unit controls the electric circuit based on the state of the battery and executes the state transition between the activation and the stop during a period from when an ignition of the vehicle is turned off to when the ignition is turned on.

8. A control method executed by a control device that controls power supply from a battery to a predetermined load via an electric circuit, the electric circuit includes a DC-DC converter that controls charging and discharging of the battery, and a relay for disconnecting the battery from the DC-DC converter, the control method comprising: an acquiring step of acquiring a state of the battery after the control device is activated; a determining step of determining whether the state of the battery is a state in which power is suppliable to the predetermined load; a controlling step of controlling the electric circuit so as to maintain a state in which the battery and the predetermined load are electrically connected to each other when the state of the battery is the state in which power is suppliable to the predetermined load; and a stopping step of stopping part of functions of the control device after the electric circuit is controlled so as to maintain the state in which the battery and the predetermined load are electrically connected to each other, wherein the DC-DC converter is controlled via a first control unit and the relay is controlled via a second control unit, and one control unit from the first control unit and the second control unit performs the acquiring step, the determining step, the controlling step, and the stopping step, and the other control unit from the first control unit and the second control unit transitions an activation state and a stop state of the control device in accordance with control executed by the one control unit.

9. A non-transitory storage medium storing instructions executed by a computer of a control device to cause the computer to perform a method that controls power supply from a battery to a predetermined load via an electric circuit, the electric circuit includes a DC-DC converter that controls charging and discharging of the battery, and a relay for disconnecting the battery from the DC-DC converter, the method comprising: an acquiring step of acquiring a physical quantity indicating a state of the battery after the control device is activated; a determining step of determining whether the state of the battery is a state in which power is suppliable to the predetermined load; a controlling step of controlling the electric circuit so as to maintain a state in which the battery and the predetermined load are electrically connected to each other when the state of the battery is the state in which power is suppliable to the predetermined load; and a stopping step of stopping part of functions of the control device after the electric circuit is controlled so as to maintain the state where the battery and the predetermined load are electrically connected to each other, wherein the DC-DC converter is controlled via a first control unit and the relay is controlled via a second control unit, and one control unit from the first control unit and the second control unit performs the acquiring step, the determining step, the controlling step, and the stopping step, and the other control unit from the first control unit and the second control unit transitions an activation state and a stop state of the control device in accordance with control executed by the one control unit.